package web

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"
	"time"

	"gitea.dooplex.hu/admin/felhom-hub/internal/store"
)

// Component log-bundle UI (v0.46.0) — the host-detail "Diagnostics" section. The
// operator requests the CONTROLLER ring (rides the report ACK, ≤ ~15 min) or the
// AGENT ring (rides the heartbeat envelope, ≈ the heartbeat cadence); the box
// pushes on its own cycle (pull-only sovereignty posture; the box's own log
// records the pull — customer-visible transparency). Bundles expire after 72 h.

// logBundleRow is the template's per-bundle/pending row.
type logBundleRow struct {
	ID          int
	Component   string
	State       string // pending | available | blocked
	RequestedAt time.Time
	CollectedAt time.Time
	ReceivedAt  time.Time
	SizeBytes   int64
	Blocked     bool
	BlockedNote string
}

// logBundleScope resolves the store scope for a component on this host: the agent
// channel is per-host; the controller channel is per-customer (the report ACK).
func logBundleScope(host *store.Host, component string) string {
	if component == store.LogBundleComponentController {
		return host.CustomerID
	}
	return host.HostID
}

// handleRequestLogBundle — POST /hosts/{id}/request-logs (form: component).
// Stores the pending pull the respective channel advertises on the box's next cycle.
func (s *Server) handleRequestLogBundle(w http.ResponseWriter, r *http.Request, hostID string) {
	if !s.validateCSRF(r) {
		http.Error(w, "Invalid CSRF token", http.StatusForbidden)
		return
	}
	host, err := s.store.GetHost(hostID)
	if err != nil || host == nil {
		http.NotFound(w, r)
		return
	}
	component := strings.TrimSpace(r.FormValue("component"))
	if component != store.LogBundleComponentController && component != store.LogBundleComponentAgent {
		http.Error(w, "Invalid component", http.StatusBadRequest)
		return
	}
	if err := s.store.RequestLogBundle(logBundleScope(host, component), component); err != nil {
		s.logger.Printf("[ERROR] RequestLogBundle %s/%s: %v", hostID, component, err)
		http.Error(w, "Internal error", http.StatusInternalServerError)
		return
	}
	s.logger.Printf("[INFO] %s log bundle requested for host %s — the box delivers on its next cycle", component, hostID)
	// Direction-2: only the CONTROLLER ring rides the report ACK (the wait channel wakes the
	// controller). The AGENT ring rides the heartbeat envelope — a separate plane this task does not
	// touch — so it is deliberately NOT bumped here.
	if component == store.LogBundleComponentController {
		s.bumpIntent(host.CustomerID)
	}
	http.Redirect(w, r, "/hosts/"+hostID, http.StatusSeeOther)
}

// handleLogBundleView — GET /hosts/{id}/log-bundles/{bundleID} renders the bundle;
// ?download=1 serves it as a plain-text .log file. Scoped to the host's own scopes.
func (s *Server) handleLogBundleView(w http.ResponseWriter, r *http.Request, hostID, bundleIDStr string) {
	host, err := s.store.GetHost(hostID)
	if err != nil || host == nil {
		http.NotFound(w, r)
		return
	}
	id, err := strconv.Atoi(bundleIDStr)
	if err != nil || id <= 0 {
		http.NotFound(w, r)
		return
	}
	// Try both scopes this host legitimately owns (agent = host_id, controller = customer_id).
	meta, lines, err := s.store.GetLogBundleContent(id, host.HostID)
	if err == nil && meta == nil {
		meta, lines, err = s.store.GetLogBundleContent(id, host.CustomerID)
	}
	if err != nil {
		s.logger.Printf("[ERROR] GetLogBundleContent %d/%s: %v", id, hostID, err)
		http.Error(w, "Internal error", http.StatusInternalServerError)
		return
	}
	if meta == nil {
		http.NotFound(w, r)
		return
	}
	if meta.Blocked {
		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
		fmt.Fprintf(w, "bundle %d (%s) is BLOCKED: %s\nNothing was stored — fix the offending log line box-side and re-request.\n",
			meta.ID, meta.Component, meta.BlockedReason)
		return
	}
	filename := fmt.Sprintf("%s-%s-%s.log", hostID, meta.Component, meta.CollectedAt.UTC().Format("20060102-150405"))
	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
	if r.URL.Query().Get("download") == "1" {
		w.Header().Set("Content-Disposition", `attachment; filename="`+filename+`"`)
	}
	for _, line := range lines {
		w.Write([]byte(line))
		w.Write([]byte("\n"))
	}
}

// hostLogBundleRows builds the host-detail Diagnostics rows: pending requests first
// (with the honest per-channel latency hint rendered template-side), then stored
// bundles newest-first. Both of this host's scopes are merged.
func (s *Server) hostLogBundleRows(host *store.Host) []logBundleRow {
	var rows []logBundleRow
	seenPending := map[string]bool{}
	for _, scope := range []string{host.HostID, host.CustomerID} {
		reqs, err := s.store.GetLogBundleRequests(scope)
		if err != nil {
			continue
		}
		for _, req := range reqs {
			// A host row only owns its own channel scopes.
			if logBundleScope(host, req.Component) != scope || seenPending[req.Component] {
				continue
			}
			seenPending[req.Component] = true
			rows = append(rows, logBundleRow{
				Component: req.Component, State: "pending", RequestedAt: req.RequestedAt,
			})
		}
	}
	for _, scope := range []string{host.HostID, host.CustomerID} {
		bundles, err := s.store.GetLogBundles(scope)
		if err != nil {
			continue
		}
		for _, b := range bundles {
			if logBundleScope(host, b.Component) != scope {
				continue
			}
			state := "available"
			if b.Blocked {
				state = "blocked"
			}
			rows = append(rows, logBundleRow{
				ID: b.ID, Component: b.Component, State: state,
				CollectedAt: b.CollectedAt, ReceivedAt: b.ReceivedAt,
				SizeBytes: b.SizeBytes, Blocked: b.Blocked, BlockedNote: b.BlockedReason,
			})
		}
	}
	return rows
}